I wanted the belts and pulleys to be on show, but I am not keen on open belts… all it takes is one stone! I have made these before out of the original covers. Start by cutting holes with a hole saw, and then cut the oval out. for this I use a saw in the dremel but a saw is OK. Then I marked the profile on some 3mm polycarbonate and cut that to shape. With that in the cut out, I drilled some 3mm holes half in the cover half in the poly. the windows are held in with some 3mm flanged bolts, washers and nylock nuts. I did ad a dab of high strength nutlock and some small neoprene washers as well.
I then hydrodipped them. I know that fake carbon is not everyone’s thing but I like it, and when covered with a lacquer its VERY durable and UV stable, unlike the real stuff! The actual process is easy, and the film and activator is cheap. link to a video below of how its done.
https://www.youtube.com/watch?v=jh6Hh1F0-Yg